听力原文：W: Good morning, I am calling to inquire about your book shelves.
M: Yes , what would you like to know？
W: Well, I'd like to check the size first.
M: The standard point is 3.2 meters wide, 1.8 meters tall and 30 centimeters deep.
W: Thanks. That is the dimensions I need.' How about the colors？
M: We have 4 colors, white, black, brown and grey.
W: I think brown is OK, what about the charge of the delivery？
M: Well it depends on how far you are from our factory？
W: We are about 5 miles from your factory.
M: I see. That is our free delivery area.
Q6. What decides whether the woman chooses？
(15)

A. The discount.
B. The weight.
C. The size.
D. The distance.